<template>
  <div class="component-upload-image">
    <el-upload multiple list-type="picture-card" ref="imageUpload" :show-file-list="true"
               :class="{ hide: fileList.length >= limit }" :limit="limit" :headers="headers" :file-list="fileList"
               :action="uploadImgUrl" :on-success="handleUploadSuccess" :before-upload="handleBeforeUpload"
               :on-error="handleUploadError" :on-exceed="handleExceed" :before-remove="handleDelete"
               :on-preview="handlePictureCardPreview">
      <el-icon class="avatar-uploader-icon">
        <el-icon-plus></el-icon-plus>
      </el-icon>
    </el-upload>
    <!-- 上传提示 -->
    <div class="el-upload__tip" v-if="showTip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
    </div>
    <el-dialog title="预览" width="800px" append-to-body :close-on-click-modal="false" v-model="dialogVisible">
      <img style="display: block; max-width: 100%; margin: 0 auto" :src="dialogImageUrl" alt="待上传文件"/>
    </el-dialog>
  </div>
</template>

<script setup>
import tokenUtil from "@/utils/token";
import config from "@/config";
import {computed, getCurrentInstance, ref, watch} from "vue";
import modal from "@/utils/modal";

const props = defineProps({
  modelValue: [String, Object, Array],
  // 图片数量限制
  limit: {
    type: Number,
    default: 5,
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 5,
  },
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: {
    type: Array,
    default: () => ["png", "jpg", "jpeg"],
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true
  },
  filePath: {
    type: String,
    default: null,
  },
});
const {proxy} = getCurrentInstance();
const emit = defineEmits(['update:filePath']);
const number = ref(0);
const uploadList = ref([]);
const dialogImageUrl = ref("");
const dialogVisible = ref(false);
const baseUrl = import.meta.env.VITE_API_URL;
// 上传的图片服务器地址
const uploadImgUrl = ref(config.API_PREFIX + "/file/uploadImage");
const headers = ref({Authorization: tokenUtil.getUserToken()});
const fileList = ref([]);
const showTip = computed(() => props.isShowTip && (props.fileType || props.fileSize));
const filePath = ref(props.filePath);
watch(() => props.modelValue, val => {
  if (val) {
    // 首先将值转为数组
    const list = Array.isArray(val) ? val : props.modelValue.split(",");
    // 然后将数组转为对象数组
    fileList.value = list.map(item => {
      if (typeof item === "string") {
        if (item.indexOf(baseUrl) === -1) {
          item = {name: item, url: item};
        } else {
          item = {name: item, url: item};
        }
      }
      return item;
    });
  } else {
    fileList.value = [];
    return [];
  }
}, {deep: true, immediate: true});

watch(() => props.filePath, (newValue) => {
  filePath.value = newValue;
});

// 上传前loading加载
function handleBeforeUpload(file) {
  let isImg = false;
  if (props.fileType.length) {
    let fileExtension = "";
    if (file.name.lastIndexOf(".") > -1) {
      fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
    }
    isImg = props.fileType.some(type => {
      if (file.type.indexOf(type) > -1) return true;
      if (fileExtension && fileExtension.indexOf(type) > -1) return true;
      return false;
    });
  } else {
    isImg = file.type.indexOf("image") > -1;
  }
  if (!isImg) {
    modal.errorMessage(`文件格式不正确, 请上传${props.fileType.join("/")}图片格式文件!`)
    return false;
  }
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize;
    if (!isLt) {
      modal.errorMessage(`上传头像图片大小不能超过 ${props.fileSize} MB!`)
      return false;
    }
  }
  modal.openLoading("正在上传图片，请稍候...");
  number.value++;
}

// 文件个数超出
function handleExceed() {
  modal.errorMessage(`上传文件数量不能超过 ${props.limit} 个!`)
}

// 上传成功回调
function handleUploadSuccess(response, file) {
  if (response.status) {
    filePath.value = response.data.fileUrl;
    // 触发update:filePath事件，将新的值传递给父组件
    emit('update:filePath', response.data.fileUrl);
    uploadList.value.push({name: response.data.fileId, url: response.data.fileUrl});
    uploadedSuccessfully();
  } else {
    number.value--;
    modal.closeLoading();
    modal.errorMessage(response.message);
    proxy.$refs.imageUpload.handleRemove(file);
    uploadedSuccessfully();
  }
}

// 删除图片
function handleDelete(file) {
  const index = fileList.value.map(f => f.name).indexOf(file.name);
  if (index > -1 && uploadList.value.length === number.value) {
    fileList.value.splice(index, 1);
    emit("update:modelValue", listToString(fileList.value));
    return false;
  }
}

// 上传结束处理
function uploadedSuccessfully() {
  if (number.value > 0 && uploadList.value.length === number.value) {
    fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value);
    uploadList.value = [];
    number.value = 0;
    emit("update:modelValue", listToString(fileList.value));
    modal.closeLoading();
  }
}

// 上传失败
function handleUploadError() {
  modal.errorMessage("上传图片失败")
  modal.closeLoading();
}

// 预览
function handlePictureCardPreview(file) {
  dialogImageUrl.value = file.url;
  dialogVisible.value = true;
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
  let strs = "";
  separator = separator || ",";
  for (let i in list) {
    if (undefined !== list[i].url && list[i].url.indexOf("blob:") !== 0) {
      strs += list[i].url.replace(baseUrl, config.API_PREFIX) + separator;
    }
  }
  return strs !== "" ? strs.substr(0, strs.length - 1) : "";
}
</script>

<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
  display: none;
}
</style>
